I had a very sad and scary encounter Sunday while riding my motorcycle. I came upon a very large dog, maybe a Rotwiller, that had been hit by a pickup truck. The dog was in the middle of the road, barking and spinning around bleeding profusely from his mouth and nose. His back leg was obviously broken and turned around the wrong direction. I immediately tried to approach the dog and try to help, but he'd have no part of that at all, and I had to resort to stand there and watch him slowly and painfully approach death. As a crowd of other people came to assist, another very large dog, probably the same breed came running up, and when he got close to the injured dog, he started to bark and attempted to lick the other dog. The next thing I knew he was visously attacking the injured dog, and had a death grip on his rear leg and the other dog tried to fight back, but was loosing the battle, because of the injuries. I was afraid to try and approach them, fearing he might turn on me, or someone else near by. The attacking dogs owner finally came and tried to pull him off the dieing dog, and struggled mightly to finally tear them apart. Once he finally got them apart, and had the dog subdued, I offered my gun to person I thought was the owner, because the poor animal needed to be put out of his misery. Then I was advised it wasn't his dog, and the owner was approaching, and at that point I withdrew to let them take care of the situation. My question is, would it have been wrong for me to put that dog down, or would it have put me in the position for a legal dispute?